2.11BSD#431 - /usr/src/usr.bin/tip/hunt.c

   1: /*
   2:  * Copyright (c) 1983 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: static char sccsid[] = "@(#)hunt.c	5.2 (Berkeley) 4/23/87";
   9: #endif not lint
  10: 
  11: #include "tip.h"
  12: 
  13: extern char *getremote();
  14: extern char *rindex();
  15: 
  16: static  jmp_buf deadline;
  17: static  int deadfl;
  18: 
  19: dead()
  20: {
  21: 
  22:     deadfl = 1;
  23:     longjmp(deadline, 1);
  24: }
  25: 
  26: hunt(name)
  27:     char *name;
  28: {
  29:     register char *cp;
  30:     int (*f)();
  31: 
  32:     f = signal(SIGALRM, dead);
  33:     while (cp = getremote(name)) {
  34:         deadfl = 0;
  35:         uucplock = rindex(cp, '/')+1;
  36:         if (mlock(uucplock) < 0) {
  37:             delock(uucplock);
  38:             continue;
  39:         }
  40:         /*
  41: 		 * Straight through call units, such as the BIZCOMP,
  42: 		 * VADIC and the DF, must indicate they're hardwired in
  43: 		 *  order to get an open file descriptor placed in FD.
  44: 		 * Otherwise, as for a DN-11, the open will have to
  45: 		 *  be done in the "open" routine.
  46: 		 */
  47:         if (!HW)
  48:             break;
  49:         if (setjmp(deadline) == 0) {
  50:             alarm(10);
  51:             FD = open(cp, O_RDWR);
  52:         }
  53:         alarm(0);
  54:         if (FD < 0) {
  55:             perror(cp);
  56:             deadfl = 1;
  57:         }
  58:         if (!deadfl) {
  59:             ioctl(FD, TIOCEXCL, 0);
  60:             ioctl(FD, TIOCHPCL, 0);
  61:             signal(SIGALRM, SIG_DFL);
  62:             return ((int)cp);
  63:         }
  64:         delock(uucplock);
  65:     }
  66:     signal(SIGALRM, f);
  67:     return (deadfl ? -1 : (int)cp);
  68: }

Defined functions

Defined variables